Abstract
The pre-arcing characteristics of the main and auxiliary chambers of a UHV circuit-breaker prototype equipped
with closing resistors are determined taking into account the actual conditions during its operational life.
The impact of considering these characteristics in the evaluation of the thermal stresses on the resistors
during the making operations on short-circuit and phase opposition is considered.
The influence of these characteristics as well as the modelling of the circuit-breakers in TNA studies is
examined with respect to the distribution of closing and reclosing overvoltages.
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